iPadOS 12.4 (build 16G5077a) is an official Apple over-the-air update for the iPad Air (China), released on 2019-07-16T17:38:56Z. The update package is 255.47 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 695bc5513b9152dc69cb440164629fd8e4b7dd4a.zip.